Not sure if anyone else had come across this similar situation...
We want to leverage the "Page Redirect" placeholder page, or even the Redirect field in a page's Page Properties, to setup a "single/global redirect" to a sister website. However, we need to be able to pass-thru query parameters during that redirect.
The kicker is, current redirects using either the "Page Redirect" placeholder page or the Page Properties redirect strips out any Query Params that may be on it. Is there a way for it to retain/pass-thru query params? So:
You properly would have to overlay this file /libs/foundation/components/page/redirect.jsp or /libs/wcm/foundation/components/page/redirect.html and correct logic for your use case. Doesn't seems to be much of work.